package chlog

import (
	"testing"
	"time"
)

func TestParseTimeSpecDurations(t *testing.T) {
	now := time.Date(2026, 8, 23, 12, 0, 0, 0, time.UTC)
	cases := map[string]time.Time{
		"15m": now.Add(-15 * time.Minute),
		"1h":  now.Add(-time.Hour),
		"2d":  now.Add(-48 * time.Hour),
		"90s": now.Add(-90 * time.Second),
		"1w":  now.Add(-7 * 24 * time.Hour),
	}
	for spec, want := range cases {
		got, err := ParseTimeSpec(spec, now)
		if err != nil {
			t.Errorf("%s: %v", spec, err)
			continue
		}
		if !got.Equal(want) {
			t.Errorf("%s: got %s, want %s", spec, got, want)
		}
	}
}

func TestParseTimeSpecRFC3339(t *testing.T) {
	now := time.Now()
	got, err := ParseTimeSpec("2026-08-23T10:30:00+10:00", now)
	if err != nil {
		t.Fatal(err)
	}
	want := time.Date(2026, 8, 23, 0, 30, 0, 0, time.UTC)
	if !got.Equal(want) {
		t.Errorf("got %s, want %s", got, want)
	}
	if got.Location() != time.UTC {
		t.Errorf("not normalized to UTC: %s", got.Location())
	}
}

func TestParseTimeSpecInvalid(t *testing.T) {
	now := time.Now()
	for _, spec := range []string{"", "abc", "1x", "-5m", "2026-13-99", "1.5h"} {
		if _, err := ParseTimeSpec(spec, now); err == nil {
			t.Errorf("%q: expected error", spec)
		}
	}
}